Toyota has called “grossly inaccurate” a news report on CNN that charges the Japanese maker with covering up a memo that could reveal additional causes for so-called “unintended acceleration.”

The Japanese giant recalled millions of vehicles in late 2009 and early 2010 due to a series of issues that could cause its vehicles to unexpectedly race out of control. But Toyota insisted that the problems did not include defective electronic control systems – a conclusion echoed by a pair of studies authorized by U.S. federal safety regulators.

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Nonetheless, the latest report by CNN, which cites internal documents, could prove problematic considering the maker is facing numerous suits by owners who claim they experienced unintended acceleration. If the network’s report proves true it could also pose a problem since the National Highway Traffic Safety Administration has already imposed record fines on Toyota for failing to properly act when it discovered prior safety-related problems.